Becoming more knowledgeable....

I want to be a good librarian, I do, but where do you start? What makes a librarian good? (Right now I really don't want to know the answer to this, it's just hypothetical.) Is it the lessons that cover library skills? Or maybe it's the lessons that cover library skills and tie to each grade level curriculum. Perhaps it is the amount, variety, cleanliness, neatness of the books within a librarian's collection. Or is it simply the smile on the librarian's face when students come in the door. An invitation to explore the books within the collection? I'm going to work really hard on this last one, and let the rest fall into place.